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LCDA24C-1.TCT Folha de dados(PDF) 4 Page - Semtech Corporation |
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LCDA24C-1.TCT Folha de dados(HTML) 4 Page - Semtech Corporation |
4 / 6 page 4 2004 Semtech Corp. www.semtech.com PROTECTION PRODUCTS PROTECTION PRODUCTS LCDA24C-1 Applications Information Device Connection for Metallic Protection of High- Speed Data Lines The LCDA24C-1 is designed to protect high-speed data lines from transient over-voltages which result from lightning and ESD. The device is designed to protect one line in common mode (Line-to-Ground) or one line pair in metallic (Line-to-Line) mode. For metallic mode protection, the input of line 1 is connected at pin 1 and the output is connected at pin 4. Likewise, the input of line 2 is connected at pin 2 and the output is con- nected at pin 3. For common mode protection, ground either pins 1 and 4 or pins 2 and 3. The ground connection should be made directly to the ground plane for best results. ADSL Protection A typical ADSL protection circuit is shown in Figure 3. A protection device with an operating voltage of 270 volts is connected on the line side of the circuit. A high voltage device is used due to the presence of the ring signal. Secondary IC side protection is achieved with low voltage TVS devices. The LCDA24C-1 is connected between to transmit line pairs. Since the LCDA24C-1 has a working voltage of 24 volts, it may be used on pairs with signal swings as high as +/-12 volts. The SD05C is used to protect the receive pairs. The signal swings on these lines can be as high as +/- 5 volts. 1 2 3 4 Line In Line In Line Out Line Out Figure 1 - Connection for Differential Protection (Line-to-Line) 1 2 3 4 Line In Line Out Figure 2 - Connection for Common Mode Protection (Line-to-Ground) Figure 3 - Typical ADSL Protection Circuit |
Nº de peça semelhante - LCDA24C-1.TCT |
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Descrição semelhante - LCDA24C-1.TCT |
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